The 1910 census shows him living with his parents and 4 siblings living in Monroe/Turner S.D. His parents, Herke Joffer born 13 Feb 1862 in Winkel & Aafje Dikstaal born in Nibbixwoud, married on 16 March 1883 in Barsingerhorn. See www.genlias.nl
with also an english interface for an index of their marriage. The original marriage record is at https://familysearch.org/pal:/MM9.3.1/TH-1-10793-28533-14?cc...
and the birthes of their childern born in the Netherlands are available at Family Search. I use www.genver.nl
and then Noord-Holland followed by Barsingerhorn to find the original marriage record there. Unfortunately is FS currently down. Maybe more another day.
They emigrated in March 1892. See Ellis Island database.